Tool holder adaptor

ABSTRACT

This adaptor is used in conjunction with lathe attachment such as a knee type tool holder and includes a body having a stem which is received by the bushing aperture of the tool holder. The adaptor body includes axial and transverse openings. The axial opening is aligned with the lathe center to receive a bushing provided with a support aperture which receives the end of relatively slender stock for pointing. The transverse opening is oversize and is adapted to receive the tool in adjustable relation to the stock.

United States Patent 1 [111 3,760,662 Brock Sept. 25, 1973 TOOL HOLDERADAPTOR Primary Examiner-Leonidas Vlachos 76 l t. I R.B k401W.M 1 men orgr zfiz 1 47229 am Att0rneyCohn, Powell & Hind [22] Filed: Aug. 20, 197157 ABSTRACT [21] Appl. No.: 173,448 This adaptor is used in conjunctionwith lathe attachment such as a knee type tool holder and includes abody having a stem which is received by the bushing 52 US. Cl. 82 Int ClB23) ;?3 aperture of the tool holder. The adaptor body includes [58]Fieid 82/35 axial and transverse openings. The axial opening is alignedwith the lathe center to receive a bushing pro- [56] References Citedvided with a support aperture which receives the end of relativelyslender stock for pointing. The transverse UNITED STATES PATENTS openingis oversize and is adapted to receive the tool lgdolller in adjustablerelation to the tock ar ow ,24o,221 9/1917 Katzmarer 82/35 4 Claims, 6Drawing Figures Pmaminsms Y 3.760.662

lNV-ENTOR IVAN R. BROCK can +bl -A ATTORNEYS TOOL HOLDER ADAPTORBACKGROUND OF THE INVENTION This invention relates in general to a toolholder assembly for use in end forming rod stock, and in particular toan adaptor which permits pointing and radiusing of relatively slenderstock.

Conventional tool holders are available for forming points and radii atthe end of rod stock. One of the more versatile lathe attachments, knownin the trade as a knee tool holder may be used to perform this functionwithin certain limits. Knee tool holders are useful for pointing rigidstock of relatively large diameter, capable of being held by the lathechuck only, but 'are not suitable for end forming slender stock of asmaller size, for example Vs inch diameter. The reason for this is thatconventional knee tool holders are not capable of supporting slenderstock adequately during the cutting operation.

Special lathe attachment equipment is available to support slender stockwhich is of such a small diameter that it is liable to spring. However,such equipment is specially designed and therefore expensive. Moreover,the support means tends to scar the work with score marks and rub marksand cannot be utilized with a conventional knee type tool holder.

SUMMARY OF THE INVENTION This adaptor is used in conjunction with a kneetype tool holder and eliminates the need for additional specialequipment by providing the knee type holder with a capability ofpointing and radiusing relatively slender stock. The adaptor is easilyattachable to conventional knee type holders without the need forspecial fasteners and may be used in conjunction with a wide variety ofsuch holders. In general, .these holders are of the type having a boredhole and mounting shank aligned with the lathe center, and are providedwith a forwardly disposed offset arm for holding a cutting tooltransversely of the lathe center. They may be connected to the tailstockof a common lathe or the turret of a turret lathe.

The adaptor includes a cylindrical body having an axis aligned with thelathe center and including an oversize transverse opening adapted toreceive the tool. Support means, carried by the body, includes a supportaperture which receives'small bar stock in journal relation duringmachining. The adaptor also includes a stem received by the bored holeof the tool holder in non-rotatable relation.

The body includes a longitudinal opening, axially aligned with the lathecenter and comprising a forward portion and rearward portion. Thesupport means includes a centrally apertured bushing receivable withinthe forward portion of the opening and providing the support aperture.The bushing faces the rearward portion of the opening which provides aknockout passage facilitating removal of said bushing.

The oversize transverse opening extends through the body and issufficiently large-to receive the tool in offset relation from the lathecenter.

Set screw means holds the bushing in place within the adaptor body andsaid screw means holds the adaptor stern within the axially bored holeof the tool holder.

The adaptor is relatively inexpensive to manufacture and provides asimple means of providing a conventional knee type tool holder with acapability of performing machining operations on relatively smalldiameter stock thereby obviating the need for special equipmentheretofore necessary to accomplish this purpose.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is an elevational view of a kneetool holder assembly incorporating the adaptor;

FIG. 2 is an end view of said assembly;

FIG. 3 is a view of the underside of the assembly;

FIG. 4 is a rear end view of the adaptor;

FIG. 5 is a sectional view taken on line 5-5 of FIG. 4; and

FIG. 6 is a sectional view taken on line 6-6 of FIG. 4.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now by characters ofreference to the drawing and first to FIG. 1 it will be understood thatthe adaptor 10 is used in conjunction with a knee type tool holdergenerally indicated by numeral 11. The tool holder 1 l is held in fixedrelation in a lathe tailstock 12, shown in broken outline. The adaptorl0 and the tool holder 11 are coaxial with the lathe center.

The tool holder 11 includes an L-shaped body 13 having a bifurcatedforward portion 14 offset from the lathe center. The forward portion 14is dovetail connected for transverse adjustment relative to the lathecenter 22, shown in FIG. 2, and consists of a pair of spaced side plates15 and 16 defining a gap 17, which is somewhat wider than an elongatecutting tool 20. The tool 20 is received and held within the gap 17 bymeans of a plurality of set screws 21. The set screws 21 provide thetool 20 with a lateral adjustment feature relative to the lathe center22. As shown in FIG. 2 the side plates 15 and 16 are offset relative tothe lathe center 22, which permits the forward edge 23 of the tool 20 tobe aligned exactly with said lathe center 22. The adjustment featureprovided by the set screws 21 permits this positioning to be selectivelyvaried within the latitude afforded by the width of the gap 17.

sockets in the end of a workpiece. Such bushings may accommodate a drillbit [not shown] suitable for performing a boring operation on aworkpiece. A set screw 30 provides a means by which drill bushings andthe like may be held in non-rotatable relation with the body 13. Thebored hole 27 and the set screw 30 are utilized to provide a means bywhich the adaptor 10 is secured in non-rotatable relation to the toolholder body 13 as will be described.

The adaptor 10 includes a substantially cylindrical body 31 providedwith a stem 32 having an axial opening 33 extending throughout itslength. A transverse opening 34 communicates with the axial opening 33.The stem 32 is slidably received within the bored hole 27 and theadaptor 10 is firmly secured to the tool holder 11 in non-rotatablerelation by means of the set screw 30. As is clearly shown from FIG. 1the adaptor is utilized to support relatively small diameter stock suchas that indicated by numeral 35 for the pointing or radiusing of the endthereof. The adaptor may also be used for relatively slender stock whichis liable to spring. In order to facilitate the machining of selectivesizes of stock, the forward portion 36 of the axial opening 33 is of asize to accommodate apertured bushings such as that indicated by numeral40. The bushing 40 is a push fit within the opening 33 and is held inplace by means of a set screw 41. The reduced rearward portion 37 of theopening 33 provides a means by which a knock-out device [not shown] maybe inserted within the adaptor 10 to effectuate the removal of thebushing 40 when the set screw 41 has been loosened. It will beunderstood that the bushing 40 includes a central aperture 42 which, ineffect, provides a journal for a selected size of stock on which themilling operation is to be performed. To this end, the aperture issubstantially equal in diameter to the size of such stock.

The transverse opening 34, as indicated in FIG. 2, is offset relative tothe lathe center 22 and accommodates the tool 20 which is likewiseoffset. It will be understood that the opening 34 is oversize andsufficiently large to permit lateral adjustment of the tool 20 relativeto said lathe center 22.

It is thought that the functional and structural advantages of thisadaptor have become fully apparent from the foregoing description ofparts but for completeness of disclosure the installation and usage ofthe device will be briefly summarized.

The tool holder 11 is mounted to the tailstock 12 in the conventionalmanner. Prior to mounting the adaptor 10 to the tool holder 11 therequisite bushing 40, having an aperture 42 matching the size of thestock to be pointed or otherwise machined, is inserted within theforward portion 36 of the axial opening 33. The stem 32 of the adaptor10 is then slidably inserted within the bored hole 27 of the tool holder11, and the set screw 30 tightened to secure said adaptor 10 in coaxialalignment with the tool holder 11 and the lathe center 22. It will beunderstood that the oversize transverse opening 34 is substantiallyaligned with the gap l7 in the tool holder body 11 so that the tool 20can be mounted and adjusted to correct position by means of set screws21. When this has been accomplished the rod stock 35, mounted in thechuck [not shown] may be advanced relative to the adaptor 10 andslidably inserted through the bushing aperture 42 into proximity withthe tool 20. The machining operation may now be commenced in the usualmanner.

I claim as my invention:

1. A lathe attachable tool holder assembly for supporting bar stockduring machining, the assembly comprising:

a. a tool holder, including:

1. a body having an axis aligned with the lathe center,

2. means adapted to attach the tool holder body to the lathe,

3. a tool including an outer end attached to the tool holder body and aninner cutting end adapted to machine the bar stock, and

b. a separable adaptor removably attached to the tool holder to providejournal support for the remote end of relatively slender bar stock,including:

1. a body having an axis aligned with the lathe center and including aforward portion, having an oversize transverse opening receiving thetool in clearance relation, and a rearward portion,

2. support means carried by the adaptor body and including an axialaperture having a support margin disposed forwardly of the tool andadapted to support bar stock during machining by the tool,

3. means removably attaching the rearward portion of the adaptor body tothe tool holder to permit independent use of the tool holder.

2. An assembly as defined in claim 1, in which:

c. the tool holder body includes a bored hole aligned with the lathecenter, and

d. the rearward portion of the adaptor body attaching the adaptor bodyto the tool holder body includes a reduced diameter axial stemreceivable by the bored hole and the forward portion of the adaptor bodyadjacent said stem is unsupported by said tool holder body.

3. An assembly as defined in claim 2, in which:

e. the oversize transverse opening of the adaptor is offset from thelathe center to facilitate lateral adjustment of the tool.

4. A lathe attachable tool holder assembly for supporting bar stockduring machining, the assembly comprising:

a. a tool holder, including:

1. a substantially ell-shaped body providing a radially outstandingportion having a bored hole axially aligned with the lathe center and aforwardly extending offset portion,

2. means adapted to attach the tool holder body to the lathe,

3. a tool including an outer end attached to the offset portion of thetool holder body in cantilever relation and an inner cutting end adaptedto machine the bar stock, and

b. a separable adaptor removably attached to the tool holder to providejournal support for the remote end of relatively slender bar stock,including:

1. a body having an axial opening aligned with the lathe center andincluding a forward portion, underlying the tool holder body offsetportion in spaced relation and having an oversize transverse openingextending therethrough and receiving the tool in clearance relation, anda rearward portion,

2. a selectively apertured bushing received by said axial opening andcarried by the adaptor body and adapted to support bar stock duringmachining by the tool,

3. stem means received by the bored hole of the tool holder body forremovably attaching the rearward portion of the adaptor body to the toolholder to permit independent use of the tool holder.

1. A lathe attachable tool holder assembly for supporting bar stockduring machining, the assembly comprising: a. a tool holder,including:
 1. a body having an axis aligned with the lathe center, 2.means adapted to attach the tool holder body to the lathe,
 3. a toolincluding an outer end attached to the tool holder body and an innercutting end adapted to machine the bar stock, and b. a separable adaptorremovably attached to the tool holder to provide journal support for theremote end of relatively slender bar stock, including:
 1. a body havingan axis aligned with the lathe center and including a forward portion,having an oversize transverse opening receiving the tool in clearancerelation, and a rearward portion,
 2. support means carried by theadaptor body and including an axial aperture having a support margindisposed forwardly of the tool and adapted to support bar stock duringmachining by the tool,
 3. means removably attaching the rearward portionof the adaptor body to the tool holder to permit independent use of thetool holder.
 2. means adapted to attach the tool holder body to thelathe,
 2. support means carried by the adaptor body and including anaxial aperture having a support margin disposed forwardly of the tooland adapted to support bar stock during machining by the tool,
 2. Anassembly as defined in claim 1, in which: c. the tool holder bodyincludes a bored hole aligned with the lathe center, and d. the rearwardportion of the adaptor body attaching the adaptor body to the toolholder body includes a reduced diameter axial stem receivable by thebored hole and the forward portion of the adaptor body adjacent saidstem is unsupported by said tool holder body.
 2. means adapted to attachthe tool holder body to the lathe,
 2. a selectively apertured bushingreceived by said axial opening and carried by the adaptor body andadapted to support bar stock during machining by the tool,
 3. stem meansreceived by the bored hole of the tool holder body for removablyattaching the rearward portion of the adaptor body to the tool holder topermit independent use of the tool holder.
 3. a tool including an outerend attached to the offset portion of the tool holder body in cantileverrelation and an inner cutting end adapted to machine the bar stock, andb. a separable adaptor removably attached to the tool holder to providejournal support for the remote end of relatively slender bar stock,including:
 3. An assembly as defined in claim 2, in which: e. theoversize transverse opening of the adaptor is offset from the lathecenter to facilitate lateral adjustment of the tool.
 3. means removablyattaching the rearward portion of the adaptor body to the tool holder topermit independent use of the tool holder.
 3. a tool including an outerend attached to the tool holder body and an inner cutting end adapted tomachine the bar stock, and b. a separable adaptor removably attached tothe tool holder to provide journal support for the remote end ofrelatively slender bar stock, including:
 4. A lathe attachable toolholder assembly for supporting bar stock during machining, tHe assemblycomprising: a. a tool holder, including: